The benchmarks so far:I used the same test suite as in fpMP3Enc (Intel Q9450, 61 WAV files, about 5 hours playing time). The compression level was 5. The files were encoded one after the other, not in parallel.

- flac 1.2.1: 3 min 26 secs- fpFLAC x64: 1 min 13 secs

So, the speedup was 2.8x. This is quite good if you consider that this version does not contain any SSE optimizations.